Pushbutton controlled sprinkler

ABSTRACT

A sprinkler has a pushbutton assembly and a piston assembly. The sprinkler has a chamber defined to receive therein the piston assembly and the pushbutton assembly. The piston assembly is controlled by the pushbutton assembly to activate the communication between the chamber in the handle of the sprinkler and the inlet of the handle. The pushbutton assembly has a pushbutton movably received in the handle to control an engagement of a piston of the piston assembly to the chamber so as that the the water flow out of the outlet is controlled by the movement of the pushbutton.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a sprinkler, and more particularly to apistol-grip sprinkler having a handle provided with an inlet, an outlet,a control chamber defined to communicate with the outlet and apushbutton assembly to control the water flow.

2. Description of Related Art

Sprinklers, especially pistol-grip sprinklers for use in gardening andcar washing, have been widely used throughout the world. The currentavailable sprinkler normally has a handle attached with a hose at theinlet thereof and a spray head at the outlet and a trigger pivotallyconnected to the handle to control the operation of a valve in thesprinkler. The design of the sprinkler is not suitable for a user tooperate for a long period of time because the user will have to apply aforce to the trigger continuously, which causes muscle fatigue. To solvethe problem, there is a securing device provided to maintain the valveopen so as to continuously keep the sprinkler in operation and solve themuscle fatigue problem. Although, the design does have the function tomeet the user's requirement, the design still has its shortcoming.Obviously, hand sizes vary all over the world, and even now people ofone country or continent may generally have a hand size different tothose of another. If sprinklers are made to one international size,users in one region may find the handle too small while those elsewheremight find it too big. Thus, some users will find it very difficult toapply a force properly and comfortably. Furthermore, the sprinklermanufacturer is not like the shoe maker that is able to make shoesaccording to the customers' different requirements and sizes. Thesprinkler manufacturer can only make sprinklers in one size, whichbrings a lot of inconvenience to different users.

To overcome the shortcomings, the present invention tends to provide animproved sprinkler to mitigate and obviate the aforementioned problems.

SUMMARY OF THE INVENTION

The primary objective of the invention is to provide an improvedsprinkler having a pushbutton to control the water flow, such that theuser will not have to hold the trigger during the entire operationprocess. The pushbutton is able to maintain the valve open or closeddepending on the user's choice. Therefore, the sprinkler having apushbutton undoubtedly brings convenience and comfort to the user.

Other objects, advantages and novel features of the invention willbecome more apparent from the following detailed description when takenin conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the sprinkler constructed in accordancewith the present invention;

FIG. 2 is an exploded view of the sprinkler of FIG. 1;

FIG. 3 is a cross sectional view of the sprinkler of FIG. 1 showing theinternal structure of the sprinkler;

FIG. 4 is an operational view in section showing the movement of thepiston in the chamber in the sprinkler;

FIG. 5A is an exploded side view showing the structure of the tubularbody, the pushbutton and the rotation button;

FIG. 5B is a schematic side view showing the engagement of the tubularbody, the pushbutton and the rotation button;

FIG. 5C is a schematic side view showing the movement rotation button bythe trigger of the pushbutton;

FIG. 5D is a schematic side view showing the shift of the rotationbutton due to the engagement between the ribs and the positioningbosses;

FIG. 6 shows a different preferred embodiment of the structure of therotation button, the pushbutton and the tubular body;

FIG. 7 is an exploded perspective view of a still another preferredembodiment of the invention;

FIG. 8 is a cross sectional view showing the internal structure afterthe parts in FIG. 7 are assembled;

FIG. 9 is a cross sectional view showing the operation of the pistonwhen the pushbutton is pressed;

FIG. 10 is an exploded side view showing the structure of thepushbutton, the controlling sleeve and the rotation button;

FIG. 11 is an exploded perspective view showing another preferredembodiment of the sprinkler constructed in accordance with the presentinvention;

FIG. 12 is a cross sectional view showing the internal structure of theassembled sprinkler of FIG. 11;

FIG. 13 is an enlarged perspective view of the controlling plate of theinvention; and

FIG. 14 is an enlarged perspective view of the controlling ring of theinvention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

Referring to FIGS. 1, 2 and 3, a sprinkler (10) constructed inaccordance with the present invention has a handle (12), a chamber (14)defined in the handle (12), a pushbutton assembly (20) received in afirst end of the chamber (14), and a piston assembly (16) received in asecond end of the chamber (14).

The handle (12) has an inlet (120) for connection with a hose (notshown), an outlet (19) for connection with a spray head (190) (shown inphantom line) and a cover (144) for covering the second end of thechamber (14).

The pushbutton assembly (20) includes a hollow tubular body (22), apushbutton (24), a rotation button (26) and a first spring (28). Thehollow tubular body (22) has an outer threading (220) formed to connectwith the first end of the chamber (14), a flange (222) formed on adistal end thereof to stop a sealing ring (228) that is mounted aroundthe tubular body (22) and multiple first and second positioning slots(2241, 2242) respectively defined in an internal periphery of the body(22). The depth of the first positioning slot (2241) is greater thanthat of the second positioning slot (2242).

The pushbutton (24) has an open end and a closed end. The open end hasan undulated edge (240) and multiple positioning bosses (242) formednear the undulated edge (240). The closed end of the pushbutton (24) isinserted into the hollow body (22). Because the multiple positioningbosses (242) are respectively received in a corresponding one of themultiple first or second positioning slots (2241, 2242), the pushbutton(24) partially extends out of the hollow body (22).

The rotation button (26) has an open end and a closed end. The rotationbutton (26) is received in the pushbutton (24) from the open end of thepushbutton (24) and has multiple ribs (260) formed on an outer peripheryof the open end to correspond to the undulated edge (240) of thepushbutton (24). When the tubular body (22), the pushbutton (24) and therotation button (26) are assembled, the multiple positioning bosses(242) are received in the first positioning slots (2241) so as to securethe engagement between the hollow body (22) and the pushbutton (24) toprevent any relative movement therebetween. The ribs (260) abut a sideface of the undulated edge (240) and then are respectively received inthe first positioning slots (2241). The ribs (260) of the rotationbutton (26) are selectively received between the first and the secondpositioning slots (2241,2242), which allows the rotation button (26) tobe rotatably received in the pushbutton (24). The first spring (28) isinserted in the rotation button (26) from the open end of the rotationbutton (26) and located around a tube (262) formed inside the rotationbutton (26). After the tubular body (22), the sealing ring (228), thepushbutton (24), the rotation button (26) and the first spring (28) areassembled according to the previously described process, a cover (226)securely fitted in the chamber (14) and having a central opening (2260)and a seal (2262) is able to allocate the above mentioned parts in oneside of the chamber (14). It is noted from FIG. 2 that a linkage (18) isprovided between the piston assembly (16) and the pushbutton assembly(20). One end of the linkage (18) extends through the seal (2262), thecentral opening (2260) of the cover (226), the first spring (28) andrests in the tube (262). The other end of the linkage (18) extendsthrough a piston (160) and is inserted into an abutting member (162).The abutting member (162) abuts a second spring (164) that is receivedin a cavity (1440) of an outer cover (144) threadingly engaged with thesecond end of the chamber (14).

With reference to FIG. 3, an assembled sprinkler in accordance with thepresent invention is shown. The assembled sprinkler shows that thepiston (160) abuts and thus closes the second end of the chamber (14)such that water from the inlet (120) can not be ejected out of theoutlet (19). Referring to FIG. 4, when the pushbutton (24) is pressedtoward the chamber (14), the positioning bosses (242) together with theribs (260) slide in the first positioning slot (2241), which pushes thefirst spring (28) and one end of the linkage (18). The linkage (18)after being pushed will drive the abutting member (162) to press thesecond spring (162). Meanwhile, the water pressure in the chamber (14)will thus force the piston (160) to move toward the outer cover (144),as shown in FIG. 4, to allow the water to flow out of the outlet (19).To provide a comfortable operation mode, the handle (12) is providedwith a function that allows the user to maintain the piston (160) in anopen state. Hereinafter is the description and principle of themechanism.

With reference to FIGS. 5A, 5B, 5C and 5D, when the pushbutton (24), therotation button (26) and the tubular body (22) are assembled, thepositioning bosses (242) and the ribs (260) are received in the firstpositioning slots (2241). Furthermore, due to the undulating edge (240),the ribs (260) only stay half way in the first positioning slots (2241),which is exactly the same as that shown in FIG. 3. After the pushbutton(24) is pushed toward the chamber (14), the positioning bosses (242)slide in the first positioning slots (2241) and the ribs (260) arepushed out of the first positioning slots (2241) by the undulating edge(240). Because of the inclined side faces of the undulating edge (240),after the ribs (260) are pushed out of the first positioning slots(2241), the ribs (260) are forced to enter the second positioning slots(2242) each having a less length than that of each first positioningslots (2241). That is, the linkage (18) is continually pushed and thusthe piston (160) is kept open to allow the water to flow out of theoutlet (19), as shown in FIG. 4. However, when the user once againpushes the pushbutton (24), the ribs (260) are forced to leave thesecond positioning slots (2242) by the undulating edge (240). When theuser stops pressing the pushbutton (24), because of the inclined sideface of the undulating edge (240), the ribs (260) slide into the firstpositioning slots (2241) to allow the piston (160) to close the secondend of the chamber (14) so as to stop the water flow out of the outlet(19), as shown from FIG. 4 to FIG. 3. To further secure the sealingeffect of the piston (160) to the chamber (14), at least one aperture isprovided in the piston (160), such that when the piston (160) is in itschamber closing state, the water from the inlet (120) will flow throughthe piston (160) by means of the aperture (1602) and stays between thepiston (160) and the outer cover (144). Accordingly, the water inbetween the outer cover (144) and the piston (160) will further forcethe piston (160) toward the chamber (14) to secure the watertightengagement.

With reference to FIG. 6, another preferred embodiment of the inventionis shown. In this embodiment, the structure is somewhat similar to thatshown in FIG. 2. The difference therebetween is that the hollow tubularbody (22′) has multiple guiding blocks (224′) spatially formed in aninternal face of the tubular body (22′). Because of the provision of themultiple guiding blocks (224′), multiple first positioning slots(2242′), second positioning slots (2243′) and third positioning slots(2244′) are respectively defined among the guiding blocks (224′). Eachof the first positioning slots (2242′) has a length longer than that ofeach of the second positioning slots (2243′). Each of the secondpositioning slots (2243′) has a length greater than that of each of thethird positioning slots (2244′).

The pushbutton (24′) has an undulating edge (240′) formed on the openend thereof and multiple positioning bosses (242′) having a total numbercorresponding to that of the first positioning slots (2242′).

The rotation button (26′) has multiple ribs (26′) having a total numbercorresponding to that of the first positioning slots (2242′).

When the tubular body (22′), the pushbutton (24′) and the rotationbutton (26′) are assembled as in the previously described manner, themultiple positioning bosses (242′) and the ribs (260′) are respectivelyreceived in the first positioning slots (2242′) and the ribs (260′) arein engagement with the inclined side face of the undulated edge (240′),which makes the ribs (260′) extend only half way into the firstpositioning slots (2242′). When the pushbutton (24′) is pushed towardthe chamber (14), the ribs (260′) are pushed out of the firstpositioning slots (2242′). Due to the inclined side face of theundulated edge (240′) and the free end of the ribs (260′), the ribs(260′) are forced to be received in the second positioning slots (2243′)to maintain the piston (160) away from the engagement with the chamber(14), such that the water from the inlet (120) will continue to flow outof the outlet (19). If the pushbutton (24′) is pushed again, the ribs(260′) are forced to leave the limit of the second positioning slots(2243′) and into the third positioning slots (2244′) in the same manneras described earlier, which allows the sprinkler of the invention tohave a smaller amount of water outflow from the outlet (19). Therefore,the user thus has three different water flow controls: stop, medium andsmall.

Referring to FIG. 7, another preferred embodiment of the invention isshown. The sprinkler (10) has a handle (12), a piston assembly (16)received in a chamber (14) in the handle (12) and a linkage (18) movablyreceived in the chamber (14) and engaged with the piston assembly (16).The parts described above are the same as that described in FIG. 2. Thedifference resides in the following description.

The sprinkler (10) further has a pushbutton assembly (30) received inthe chamber (14) and relative to the piston assembly (16). Thepushbutton assembly (30) has a tubular body (32), a pushbutton (34), acontrolling sleeve (35), a rotation button (36) and a spring (38).

The tubular body (32) has a threading (320) for assembly with the handle(12), a flange (322) formed on a distal end thereof for limiting themovement of a sealing ring (328) after being mounted around the tubularbody (32) and a step (324) formed on a inside periphery thereof, asshown in FIG. 8.

The pushbutton (34) has an open end and a closed end. The pushbutton(34) further has a block ring (340) formed near the open end, and aninner tube (342) formed inside the pushbutton (34) and having anundulating edge (344) formed on a free end thereof. The pushbutton (34)is inserted in the tubular body (32) and the block ring (340) engagesthe step (324) so as to limit the further insertion of the pushbutton(34) into the tubular body (32).

The controlling sleeve (35) is received in the pushbutton (34) andoutside the inner tube (342). The controlling sleeve (35) has a stop(350) formed on an outer periphery thereof and multiple positioningslots (352) defined in an inner periphery thereof. The positioning slots(352) are composed of multiple first positioning slots (3520) andmultiple second positioning slots (3522). Each first positioning slot(3520) has a length greater than that of each second positioning slot(3522).

The rotation button (36) is movably received in the controlling sleeve(35) and has a head (362) formed on a distal end thereof. The head (362)has at least one boss (364) formed on an outside periphery thereof tocorrespond to one of the first and second positioning slots (3520,3522)of the controlling sleeve (35), and a blind hole (366) defined in acenter thereof. The rotation button (36) is inserted into thecontrolling sleeve (35) from a distal end relative to the head (362).After the rotation button (36) is inserted in the controlling sleeve(35), the boss (364) is received in one of the multiple positioningslots (352) and abuts an inclined side face of the undulating edge(344). A distal end of the spring (38) engages with an outside face ofthe head (362).

After the pushbutton (34), the controlling sleeve (35), the rotationbutton (36) and the spring (38) are assembled in the tubular body (32),a cover (326) is provided to enclose the above mentioned parts in thetubular body (32).

The cover (326) has a recess (3260) for receiving therein a securingring (3266), a through hole (3262) in a bottom face defining the recess(3260) and a notch (3264) defined in a back face of the cover (326) andcorresponding to the stop (350) of the controlling sleeve (35). When thepushbutton (34) is pressed toward the chamber (14), the inclined sideface of the undulating edge (344) pushes the boss (364) of the rotationbutton (36) away from the limit of the first position slot (3520). Afterthe boss (364) is pushed away from the limit of the first positioningslot (3520), due to the provision of the relative end faces of the boss(364) and the inclined side face of the undulating edge (344), the boss(364) slides into the second positioning slot (3522). Referring to FIG.9 and taking FIG. 10 for reference, when the piston (160) is inwatertight engagement with the chamber (14), the boss (364) is receivedin the first positioning slot (3520). After the pushbutton (34) ispressed, the boss (364) leaves the limit of the first positioning slot(3520) and falls into the second positioning slot (3522). Because eachfirst positioning slot (3520) has a length greater than that of eachsecond positioning slot (3522), the piston (160) will not engage withthe chamber (14), and thus water is allowed to enter the chamber (14)and exit from the outlet (19).

While the boss (364) stays in the second positioning slot (3522), theuser will not have to continue pressing the pushbutton (34), whichbrings convenience to the user.

With reference to FIG. 11, a still further preferred embodiment of thepresent invention is shown. The sprinkler (10) has a handle (12), apiston assembly (16) received in a chamber (14) in the handle (12) and alinkage (18) movably received in the chamber (14) and engaged with thepiston assembly (16). The parts described above are the same as thosedescribed in FIG. 2. The difference resides in the followingdescription.

The sprinkler (10) further has a pushbutton assembly (40). The pushbutton (40) has a tubular body (42), a pushbutton (44), a firstpositioning seat (45), and a second positioning seat (46).

The tubular body (42) has a threading (420) for assembly with the handle(12), a flange (422) formed on a distal end thereof for limiting themovement of a sealing ring (428) after being mounted around the tubularbody (42), and a step (424) formed on an inside periphery thereof, asshown in FIG. 12.

The pushbutton (44) is a tube-like member and has a plug (440) providedto extend out of the tubular body (42) for the user to press, anengaging end (442) located relatively to the plug (440), a channel (444)defined therein for movably receiving a first spring (446) and a pin(448).

The first positioning seat (45) has a central opening (450) defined toallow the engaging end (442) to extend therethrough and a controllingplate (48) located in a periphery defining the central opening (450) andcorresponding to the channel (444) of the pushbutton (44).

The second positioning seat (46) has a path (460) defined to receivetherein a slider (462) and a second spring (464). The slider (462) has ablind hole (4620) defined to receive a distal end of the linkage (18).

When the above mentioned parts are assembled in the tubular body (42),as shown in FIG. 12, that is, the plug (440) of the pushbutton (44)extends out of the tubular body (42) and the engaging end (442) engageswith the slider (462) after extending through the central opening (450)and into the path (460) of the second positioning seat (46), a cover(426) with a through hole (4260) is provided to enclose all the aboveparts in the tubular body (42). Then the tubular body (42) isthreadingly connected to the handle (12) of the sprinkler (10) of theinvention. Before the cover (426) encloses the mentioned parts in thetubular body (42), a seal (4262) is located in the through hole (4260).After the above mentioned assembly is finished, one distal end of thelinkage (18) extends through the seal (4262), the through hole (4260) ofthe cover (426), the second spring (464) and into the blind hole (4260)in the slider (462). The other end of the linkage (18) extends throughthe piston (160) and into the abutting member (162). Thereafter, whenthe user pushes the plug (440), the push of the engaging end (442) tothe slider (462) and accordingly to the linkage (18) will make thepiston (160) to open and thus allow water to enter the chamber (14) inthe handle (10). Thus, the water in the chamber (14) will be ejectedfrom the outlet (19). To facilitate the operation of the sprinkler (10),a positioning device is provided to maintain the piston (160) in an openstate, such that the user will not have to keep pressing the plug (440)all the time during the operation of the sprinkler (10). That is,referring to FIGS. 13 and 14, when the user presses the plug (440), thepin (448) in the pushbutton (44) will also be pushed and will move froma first position (481) in a limiting groove (480) defined in thecontrolling plate (48) to a second position (482). During the movementof the pin (448), due to the provision of a first turning point (483)before the second position (482) and a second turning point (484) afterthe second position (482), when the pin (448) reaches the first turningpoint (483), the user releases the plug (440), the force in thecompressed second spring (464) will push the pin (448) backward to thesecond position (482). While the pin (448) stays in the second position(482), the piston (160) stays separate from the second end of thechamber (14) to allow water to be ejected from the outlet (19). When theplug (440) is pressed again, the pin (448) will move from the secondposition (482) to the second turning point (484) and the force from thecompressed second spring (464) will force the pin (448) back to thefirst position (481) to allow the piston (160) to close the chamber(14), which stops the ejection of water from the outlet (19).

It is to be understood, however, that even though numerouscharacteristics and advantages of the present invention have been setforth in the foregoing description, together with details of thestructure and function of the invention, the disclosure is illustrativeonly, and changes may be made in detail, especially in matters of shape,size, and arrangement of parts within the principles of the invention tothe full extent indicated by the broad general meaning of the terms inwhich the appended claims are expressed.

What is claimed is:
 1. A sprinkler comprising: a spray head; a handle having an inlet for connecting with a water source, an outlet selectively communicating with the inlet and engaged with the spray head and a chamber defined for receiving therein a piston assembly for controlling the communication between the inlet and the outlet; and a pushbutton assembly received in the chamber relative to the piston assembly for controlling actuation of the piston assembly, wherein a linkage is provided between the piston assembly and the pushbutton assembly to drive movement of a piston in the chamber, wherein the piston assembly further comprises: an abutting member for receiving therein a first distal end of the linkage after extending through the piston; a first spring a first end of which engages with the abutting member; and an outer cover threadingly engaged with the handle to cover a first opening of the chamber and to enclose the first spring, the abutting member and the piston in the chamber, and wherein the pushbutton assembly comprises: a tubular body threadingly engaged with the handle to cover a second opening of the chamber and having a flange formed on a distal end thereof to stop a sealing ring that is mounted around the tubular body and multiple positioning slots respectively defined in an internal periphery of the body; a pushbutton having an open end provided with an undulated edge and multiple positioning bosses formed near the undulated edge and corresponding to a respective one of the multiple positioning slots and a closed end inserted into and extending out of the tubular body; a rotation button movably received in the pushbutton and having multiple ribs formed on an outer periphery thereof to engage with the undulated edge of the pushbutton and detachably connected with the multiple positioning slots of the pushbutton; a second spring inserted in the rotation button and located around a tube in the rotation button; and a cover securely formed in the chamber and having a central opening and a seal enabling to allocate the above mentioned parts in one side of the chamber; wherein each of the ribs abuts a respective one of a plurality of inclined side faces of the undulating edge so that the rotation button is movably received in the pushbutton when the pushbutton is pushed.
 2. The sprinkler as claimed in claim 1, wherein one end of the linkage extends through the seal, the central opening of the cover, the second spring and rests in the tube of the rotation button.
 3. The sprinkler as claimed in claim 1, wherein the positioning slots comprise multiple first positioning slots and multiple second positioning slots and each first positioning slot has a length greater than that of each second positioning slot.
 4. The sprinkler as claimed in claim 3, wherein the ribs are selectively received in the first positioning slots and the second positioning slots thereby the rotation button is rotatably received in the pushbutton.
 5. The sprinkler as claimed in claim 1, wherein the positioning slots comprise multiple first positioning slots, multiple second positioning slots and multiple third positioning slots; wherein each first positioning slot has a length greater than that of each second positioning slot; and wherein each second positioning slot has a length greater than that of each third positioning slot; thereby the piston has three different positions to control the communication of the inlet in the chamber.
 6. The sprinkler as claimed in claim 1, wherein the pushbutton assembly comprises: a tubular body having a threading for assembly with the handle, a flange formed on a distal end thereof for limiting the movement of a sealing ring after being mounted around the tubular body and a step formed on an inside periphery thereof; a pushbutton movably inserted into and extending out of the tubular body and having a block ring engaged with the step to prevent further insertion into the tubular body, an inner tube formed inside the pushbutton and having an undulating edge formed on a free end thereof; a controlling sleeve received in the pushbutton and outside the inner tube and having a stop formed on an outer periphery thereof and multiple positioning slots defined in an inner periphery thereof; a rotation button movably and rotatably received in the controlling sleeve and having a head formed on a distal end thereof and having at least one boss formed to correspond to one of the positioning slots of the controlling sleeve and a blind hole defined in a center of the head for receiving one end of the linkage; and a cover provided to enclose the above mentioned parts in the tubular body and having a recess for receiving therein a securing ring, a through hole in a bottom face defining the recess and a notch defined in a back face of the cover and corresponding to the stop of the controlling sleeve; wherein after the pushbutton is pressed toward the chamber, an inclined side face of the undulating edge pushes the boss of the rotation button away from the limit of the respective position slot to allow the boss to slide into adjacent positioning slot.
 7. The sprinkler as claimed in claim 6, wherein the multiple positioning slots comprise multiple first positioning slots and multiple second positioning slots, wherein each first positioning slot has a length greater than that of each second positioning slot.
 8. The sprinkler as claimed in claim 6, wherein the multiple positioning slots comprise multiple first positioning slots, multiple second positioning slots and multiple third positioning slots, wherein each first positioning slot has a length greater than that of each second positioning slot, and wherein each second positioning slot has a length greater than that of each third positioning slot.
 9. The sprinkler as claimed in claim 7, wherein each first and second positioning slots are alternatively arranged.
 10. The sprinkler as claimed in claim 8, wherein each first, second and third positioning slots are alternatively arranged.
 11. The sprinkler as claimed in claim 1, wherein the pushbutton assembly comprises: a tubular body having a threading for assembly with the handle, a flange formed on a distal end thereof for limiting the movement of a sealing ring after being mounted around the tubular body and a step formed on an inside periphery thereof; a pushbutton having a plug provided to extend out of the tubular body for the user to press and an engaging end located relatively to the plug; a first positioning seat received in the tubular body and having a central opening defined to allow the engaging end to extend therethrough; a second positioning seat having a path defined to movably receive therein a slider and a second spring, wherein the slider has a blind hole defined to receive a distal end of the linkage; and a cover provided to enclose the first positioning seats, the second positioning seats and the pushbutton in the tubular body.
 12. The sprinkler as claimed in claim 11, wherein a channel is defined in the pushbutton for movably receiving therein a spring and a pin and wherein a controlling plate is provided in the first positioning seat to correspond to the pin so as to selectively position the pin in either a first position or a second position on the controlling plate respectively to control the communication between the inlet and the chamber.
 13. The sprinkler as claimed in claim 12, wherein the controlling plate has a limiting groove and is provided with a first turning point before the second position and a second turning point after the second position such that when the pin reaches the first turning point, the force of the second spring will push the pin backward to the second position, thereby allowing water to be ejected from the outlet and when the pin reaches the second turning point, the force of the second spring will push the pin backward to the first position, thereby allowing the piston to stop communication between the inlet and the chamber. 